Arylenedialkylidene polymers for high performance ion exchange m

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Ion-exchange polymer or process of preparing

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521 33, B01D 7168, B01D 7176

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active

056249659

ABSTRACT:
The present invention discloses permselective membranes comprising at least one layer formed from an arylenedialkylidene polymer at least a portion of which is sulfonated, said arylenedialkylidene polymer comprising recurring monomeric units as shown by the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are alkyl having one to four carbon atoms; wherein A and B are different;
A is selected from the group consisting of ##STR2## wherein R.sub.x is hydrogen or an alkyl having 1 to 4 carbon atoms, R.sub.5 is alkylidene of 1-4 carbon atoms or oxyalkylene of 1-4 carbon atoms;
B is derived from the group consisting of benzene, naphthalene, thiophene, and aromatic compounds of the formula ##STR3## wherein R.sub.6 is selected from the group consisting of alkylidene of 1-4 carbon atoms, oxyalkylene of 1-4 carbon atoms, --O--, --S--; R.sub.7 and R.sub.8 may be the same or different and may be H or methyl; and n is a number sufficient to provide a copolymer having a molecular weight sufficient to form a film. Processes for making said membranes and their use as ion exchange membranes are also disclosed.

REFERENCES:
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patent: 4866099 (1989-09-01), Hendy
A. Fritz et al., "Synthesis of Aryleneisopropylidene Polymers", J. Pol. Science, Part A-1, 10, pp. 2365-2378, (1972).
R.E. Kesting, "Synthetic Polymeric Membranes", A Structural Perspective, 2nd. Ed., Wiley Interscience Publication, J. Wiley & Sons, (1985).

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